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Respiratory Case Histories - Case 13 A 150 lb., 62-year-old man had a chronic productive cough, exertional...

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Medical Sciences

Respiratory Case Histories - Case 13

A 150 lb., 62-year-old man had a chronic productive cough,exertional dyspnea, mild cyanosis, and marked slowing of forcedexpiration. His pulmonary function and laboratory tests follow:

Frequency16 breaths/min
Alveolar ventilation4.2 L/min
Vital capacity (VC)2.2 L
Functional residual capacity (FRC)4.0 L
Total lung capacity (TLC)5.2 L
Maximum inspiratory flow rate250 L/min
Maximum expiratory flow rate20 L/min
PaO262 mm Hg
PaCO239 mm Hg

Pulmonary function tests after bronchodilator therapy:

Frequency16 breaths/min
Alveolar ventilation4.35 L/min
VC2.4 L
FRC4.0 L
TLC5.2 L
Maximum inspiratory flow rate250 L/min
Maximum expiratory flow rate23 L/min
PaO262 mm Hg
PaCO238 mm Hg

1. What is the disorder of this 62-year-old man?

2. Is this primarily a restrictive or an obstructive disorder?Why?

3. Why is the bronchodilator therapy ineffective in thisman?

4. What causes the hypoxemia?

6. What is the cause of this altered RV?

7. Calculate the tidal volume (TV) for this person before andafter the bronchodilator therapy.

8. Is each TV normal or altered?

9. Calculate the minute ventilation (MV) for this person beforeand after the bronchodilator therapy.

10. Is each MV normal or altered?

Answer & Explanation Solved by verified expert
4.4 Ratings (874 Votes)
This patient is likely to be suffering from chronic obstructive airway disease Explanation History Productive cough as airways are inflamed Exertional dyspnea Signs cyanosis Pulmonary function Reduce forced expiration FEV Reduced expiratory flow rate which improved with bronchodilator therapy Reduced vital capacity which improved with bronchodilator therapy Functional residual volume is high All these factors point towards an    See Answer
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